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Close doublet structures in , and neighbours: rotation-alignment for the half-filled subshell?

J K Hwang1, A V Ramayya1, J H Hamilton1, L K Peker1, J Kormicki1, B R S Babu1, T N Ginter1, C J Beyer1, G M Ter-Akopian1,2,3, Yu Ts Oganessian2, A V Daniel1,2,3, W C Ma4, P G Varmette4, J O Rasmussen5, S J Asztalos5, S Y Chu5, K E Gregorich5, A O Macchiavelli5, R W Macleod5, J Gilat5, J D Cole6, R Aryaeinejad6, K Butler-Moore6, M W Drigert6, M A Stoyer7, L A Bernstein7, R W Lougheed7, K J Moody7, S G Prussin8, H C Griffin9 and R Donangelo10

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LETTER TO THE EDITOR

Several new transitions are assigned to and in a coincidence study from the spontaneous fission of with 72 Compton suppressed Ge detectors in Gammasphere. A close doublet structure of an odd-parity band except near its bandhead is a common feature not only of the nuclei studied here but of many others with . This doublet structure may be a general consequence of rotation alignment for configurations of half-filled j-shells, which are only weakly coupled to the deformed shapes.


PACS

25.85.Ca Spontaneous fission

27.90.+b A ≥ 220

21.10.Hw Spin, parity, and isobaric spin

23.40.Hc Relation with nuclear matrix elements and nuclear structure

27.70.+q 150(less-than-or-equal-to)A(less-than-or-equal-to)189

23.20.Lv gamma transitions and level energies

Subjects

Nuclear physics

Dates

Issue 1 (January 1998)

Received 22 September 1997



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